Alphagrog is a volcanic rock, proven to be a successful filter media as it ideal for the colonization of beneficial bacteria. The porous composition of this media allows the bacteria to multiply in abundance over a short period of time. The sharp edges of this natural rock require careful handling, and it is best situated in the last chamber of your filter, as you would not want your Koi rubbing against it! Remember to wear protective gloves whilst cleaning.
Collection from our premises near Chepstow in South Wales by appointment or delivery to British mainland addresses.
Delivery is £8.95 per order for most dry goods, with some more expensive delivery charges applicable for very heavy or long items.
Please note delivery for dry goods is typically 2-5 working days and items may be sent in separate packages.